When we visited in July, the weather forecast for Jungfrau was partly sunny with showers the day before. Next morning we checked the telecast on TV which keeps flashing the situation on all the peaks around Interlaken and saw that all mountains were in clouds! We changed our plan and visited the Lauterbrunnen, Trummelbach falls etc.. Towards noon, we saw the weather clear. When we went to station around 1pm, we were shown the situation on TV which had cleared up, at the ticket counter. Then we purchased the tickets and really enjoyed the Jungfrau ride and the mountain!